Migrating Your Most Critical Feature Without Regressions or Downtime

on YouTube ↗50m

" summary

A small team needed to stabilize and migrate a web app’s most critical feature without downtime or regressions by avoiding a full rewrite. The talk explains a step-by-step approach using SQL transactions, metrics collection, automated tests, feature flags, double-run (parallel execution), and Domain-Driven Design to incrementally reduce technical debt (business logic in the frontend, overloaded CRUD API, database deadlocks) while improving stability and performance.

AI-written summary · about

" chapters (15)

1. 0:00Introduction
2. 1:06Critical context
3. 9:24Initial architecture
4. 13:30High error rates
5. 17:31Migration design
6. 19:41Monitoring setup
7. 21:57Domain-oriented API
8. 24:29Incremental problem split
9. 28:10Production validation
10. 31:02Testing and dual run
11. 33:12Progressive deployment
12. 36:46Results and minor incidents
13. 37:34Key lessons
14. 41:19Two-year review
15. 42:03Q&A

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